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An opinionated, annotation-based command framework (bukkit, paper, velocity, fabric, minestom, hytale)

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// repository documentation

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# Blade

> [!IMPORTANT]
> As of `1.1.0`, Blade uses [Kyori Adventure](https://docs.papermc.io/adventure/)
> `Component`s on all platforms instead of platform-specific text types.
> Each platform converts these to its native text when sending. If you
> implemented `CommandFeedback`, `HelpGenerator`, `BladePlatform` or `Sender` yourself,
> you'll need to update your code for this change.

Blade is an easy-to-use command framework based on annotations.

If you make any changes or improvements to the project, please consider making a pull request to merge your changes back
into the upstream project.
If you find any issues please open an issue.

This project follows [Semantic Versioning](https://semver.org/).

## YourKit

YourKit supports open source projects with innovative and intelligent tools for monitoring and profiling Java and .NET
applications. YourKit is the creator
of [YourKit Java Profiler](https://www.yourkit.com/java/profiler/), [YourKit .NET Profiler](https://www.yourkit.com/.net/profiler/)
and [YourKit YouMonitor](https://www.yourkit.com/youmonitor/).

![YourKit](https://www.yourkit.com/images/yklogo.png)

## Supported Platforms

### Bukkit

Use the `bukkit` artifact. Supports Java 8+.

> [!NOTE]
> Blade depends on Kyori Adventure, which legacy Spigot does not ship.
> When shading Blade into your plugin, relocate `net.kyori` to avoid classpath
> conflicts with other plugins or the server.

### Paper

- Minecraft 1.13+ (Java 21+): use the `paper` artifact
- Minecraft 1.13+ (Java 17-21): use the `paper-legacy` artifact
- Minecraft <1.13 or Java <17: use the `bukkit` artifact

Unfortunately we had to split the Paper artifact into two due to newer Paper API versions requiring Java 21 (Minecraft
1.20.6 and above). We have to depend on those newer APIs to provide proper Brigadier support.

### Fabric

- Minecraft 26.1+ (Unobfuscated): use the `fabric` artifact
- Minecraft <26.1 or Obfuscated: use the `fabric-legacy` artifact

> [!WARNING]
> Make sure to use `include(modImplementation("..."))` to add Blade as a jar-in-jar dependency. You'll have
> to include the `fabric`, `brigadier`, and `core` modules as Fabric Loom doesn't resolve transitive dependencies.
> For unobfuscated environments, use `implementation` instead of `modImplementation`.

> [!TIP]
> Blade uses [Lucko's Fabric Permissions API](https://github.com/lucko/fabric-permissions-api) for permission checks on
> Fabric. Plugins such as LuckPerms provide support for this API.

### Velocity

Use the `velocity` artifact.

### Minestom

Use the `minestom` artifact.

### Hytale

Use the `hytale` artifact.

## Usage

### Maven

```xml

<dependencies>
    <dependency>
        <groupId>io.github.vaperion.blade</groupId>
        <artifactId>PLATFORM</artifactId>
        
        <version>VERSION</version>
        <scope>provided</scope>
    </dependency>
</dependencies>
```

### Gradle

```groovy
dependencies {
    // Replace VERSION with your desired version
    implementation 'io.github.vaperion.blade:PLATFORM:VERSION'
}
```

### Creating an example command

```java
public class ExampleCommand {
    @Command("example")
    @Description("The description of your command, optional.")
    @Permission("command.permission") // Optional, set to "op" to require OP
    @Hidden // Optional, hides the command from the generated help
    @Async // Optional
    @Quoted // Optional, parses quoted strings into a single argument
    public static void example(
        // Command sender, required:
        @Sender CommandSender sender,
        // Type can be: CommandSender, Player, ConsoleCommandSender
        // Or any custom type if you register a SenderProvider<T>.

// Regular arguments:
        @Name("player") Player player,
        // You can make the argument optional (will be null if not provided):
        @Name("player") @Opt Player player,
        // or, you can make it default to the sender if not provided:
        @Name("player") @Opt(Opt.Type.SENDER) Player player,
        // Multi-word (combined) string arguments:
        @Name("message") @Greedy String message,
        // Number arguments with a range:
        @Name("amount") @Range(min = 1, max = 64) int amount,

// You can also use custom providers for just one argument:
        @Provider(MyPlayerProvider.class) Player customPlayer,
        // And you can specify the scope (`BOTH`, `PARSER`, `SUGGESTIONS`), defaults to `BOTH`:
        @Provider(value = MyPlayerProvider.class, scope = Provider.Scope.SUGGESTIONS) Player customPlayer2,

// Command flags:
        @Flag(value = 's', description = "Optional description") boolean flagSilent,
        // You can also have complex types as flags:
        @Flag('p') Player anotherPlayer
    ) {
        sender.sendMessage("(You -> " + anotherPlayer + ") $" + amount);

if (!flagSilent) {
            player.sendMessage("(" + sender.getName() + " -> You) +$" + amount);
        } else {
            player.sendMessage("(Anonymous -> You) +$" + amount);
        }
    }
}
```

### Creating an example argument type

> [!WARNING]
> Argument provider instances must be stateless, as a single instance will be used for all commands.
> If you do have to store some state, make sure to account for that.

```java
public class Data {
    public String message;
    public boolean wasProvided;
}

public class DataArgumentProvider implements ArgumentProvider<Data> {
    @Override
    public @Nullable Data provide(@NotNull Context ctx, @NotNull InputArgument arg) {
        Data data = new Data();

if (arg.status() == InputArgument.Status.NOT_PRESENT) {
            data.wasProvided = false;
            data.message = "Default value: " + arg.value();
        } else {
            data.wasProvided = true;
            data.message = arg.value();
        }

// If you encounter an error while parsing, you may:
        throw new BladeUsageMessage(); // to show the usage message
        // or, to fail the command execution with a custom message:
        throw BladeParseError.fatal("Custom error message");
        // or, to allow recovery if the argument is optional:
        throw BladeParseError.recoverable("Custom error message");

return data;
    }

@Override
    public void suggest(@NotNull Context ctx, @NotNull InputArgument arg, @NotNull SuggestionsBuilder suggestions) {
        suggestions.suggest("example");
    }
}
```

### Registering your commands and argument types

```java
public class MyPlugin extends JavaPlugin {
    @Override
    public void onEnable() {
        Blade.forPlatform(new BladeBukkitPlatform(this))
            .config(cfg -> {
                cfg.commandQualifier("myplugin"); // Optional, defaults to your plugin's name
                cfg.defaultPermissionMessage("No permission!"); // Optional
            })
            .bind(binder -> {
                binder.release(Player.class); // To remove the default provider
                binder.bind(Player.class, new MyPlayerProvider()); // To add your own
                binder.bindSender(MySender.class, new MySenderProvider()); // To add your own sender provider
            })
            .build()
            // Now, you can register all commands in a package (including sub-packages):
            .registerPackage(MyPlugin.class, "com.example.commands")
            // or, you can register them individually:
            .register(ExampleCommand.class).register(AnotherCommand.class)
        ;
    }
}
```

### Localizing your commands

Blade can localize user-facing messages.

```java
public class ExampleLocalizer implements CommandLocalizer {
    @Override
    public @NotNull Locale localeOf(@NotNull Sender<?> sender) {
        Player player = sender.parseAs(Player.class);
        return player != null ? player.locale() : Locale.US;
    }

@Override
    public @NotNull String commandDescription(@NotNull Sender<?> sender,
                                              @NotNull BladeCommand command,
                                              @NotNull String fallback) {
        return ExampleI18n.get(localeOf(sender), "commands." + command.mainLabel() + ".description", fallback);
    }
}
```

```java
Blade.forPlatform(new BladeBukkitPlatform(this))
    .config(cfg -> cfg.localizer(new ExampleLocalizer()))
    .build();
```

A few notes:

- Rendered usage and help messages are cached per `localeOf` result.
- Brigadier node names (the client-side `<arg>` hints) stay unlocalized.

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